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14 Cards in this Set
- Front
- Back
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Magma
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molten rock generated in the interior of the Earth
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Ring of Fire
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the narrow belt of volcanoes around the Pacific Ocean
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hot spot
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a fixed source of abundant rising magma
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seamounts
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volcanic islands that are so old that they have had time to sink slowly into the plate, due to their weight
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map projections
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maps that show the Earth's surface features on a two-dimensional plane
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contour lines
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lines that connect points of equal elevation on a land surface
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contour intervals
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the difference in elevation between adjacent contour lines
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topographic map
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a map showing the topographic features of a land surface, including how steep or gentle a slope is.
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relief
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the difference in elevation between the highest and lowest points on a map
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igneous rock
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a rock that forms when molten materials become solid
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silica
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silicon oxide; the most abundant oxide in magma
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shield volcano
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a broad, gently sloping volcanic cone of flat-dome shape, formed by the eruption of low-silica magma
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composite cone volcano (stratovolcano)
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a volcano formed the eruption of magma with medium to high silica content
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caldera
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a large volcanic depression formed by the collapse of overlying rock due to erupting magma
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